package com.nowcoder.community.controller.interceptor;

import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.CookieUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.expression.spel.ast.NullLiteral;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

@Component
public class LoginTicketInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 从cookie中获取凭证
        String ticket = CookieUtil.getValue(request,"ticket");

        if ( ticket != null ) {
            //查询凭证
            var loginTicket = userService.findloginTicket(ticket);
            //检查凭证是否有效
            if(loginTicket != null && loginTicket.getStatus() == 0 && loginTicket.getExpired().after(new Date())){
                //根据凭证查询用户
                var user = userService.findUserById(loginTicket.getUserId());
                // 在本次请求中持有用户
                hostHolder.setUsers(user);

            }
        }
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView){
        User user = hostHolder.getUser();
        if(user !=null && modelAndView !=null ) {
            modelAndView.addObject("loginUser",user);
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request,HttpServletResponse response,Object Handler,Exception ex) throws Exception {
        hostHolder.clear();
    }
}
